While there was Mess Rugby and other "games," my recollection of the most extreme activity was the "Tunnel of Love!"
Turn the ante-room armchairs over onto their front. Manouvre them into a tunnel, say 20ft long. Two teams, each enters the tunnel from opposite ends and the first team to exit the other end complete wins. Any arms, legs, or other body parts that leave the intermediate tunnel sides or top means disqualification.
Tactics usually involved grabbing the last person in the opposing team. Little guys went first and everyone tried to grab and slow the opposition (I always went first!). In the dark any number of scores could and would be settled!
Happy days.
Vernon